Inspection Procedure 7: Starting Impossible (Initial Combustion But No Complete Combustion), Improper Starting (Long Time to Start)

COMMENT ON TROUBLE SYMPTOM

Failure is possibly caused by poor ignition, incorrect air-fuel ratio at cranking, improper fuel pressure or other faults.

PROBABLE CAUSES

Failed battery
Failed ignition system
Failed fuel system
Air-fuel ratio control
Failed throttle valve control system
Failed intake system
Throttle valve fouled around
Timing chain not in place
Compression pressure improper
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

Measure battery voltage at cranking.

OK: 8 V or higher

Q. Is the check result normal?

	Go to Step 2 .

	Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).

STEP 2. M.U.T.-III diagnosis code

Q. Diagnosis code set?

	Inspection chart for diagnosis codes (Refer to ).

	Go to Step 3 .

STEP 3. M.U.T.-III data list

Refer to Data List Reference Table .

Item No. 6: Intake air temperature sensor
Item No. 7: Manifold absolute pressure sensor
Item No. 8: Engine coolant temperature sensor

Q. Are the check results normal?

	Go to Step 4 .

	Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

STEP 4. Check throttle body (throttle valve) contamination.

Q. Is the check result normal?

	Go to Step 5 .

	Clean throttle body (throttle valve portion) (Refer to ).

STEP 5. M.U.T.-III actuator test

Item No. 5: Fuel pump

OK: Operating sound of fuel pump can be heard.

Q. Is the check result normal?

	Go to Step 6 .

	Check fuel pump system (Refer to Inspection Procedure 30 ).

STEP 6. Check injector for operating sound.

Check injector for operating sound at engine cranking (Refer to ).

Q. Can operating sound be heard?

	Go to Step 7 .

	Check the injector system of the defective cylinder. (Refer to Code No. P0201: No.1 Injector System .) (Refer to Code No. P0202: No.2 Injector System .) (Refer to Code No. P0203: No.3 Injector System .)

STEP 7. Check timing marks of timing chain.

Q. Is the check result normal?

	Go to Step 8 .

	Align timing marks.

STEP 8. Visual check of ignition spark.

Remove the spark plug and install to the ignition coil.
Connect the ignition coil connector.
Remove all injector connectors.
At the engine start, check each spark plug procedure a spark.

Q. Is the check result normal?

	Go to Step 9 .

	Check ignition circuit system (Refer to Inspection Procedure 32 <134>, Inspection Procedure 33 <3A9>).

STEP 9. Check spray condition of injector.

Check each injector for spray condition (Refer to ).

Q. Is the check result normal?

	Go to Step 10 .

	Replace the injector.

STEP 10. Check compression pressure.

Check compression pressure (Refer to GROUP 11A - On-vehicle Service - Compression Pressure Check ).

Q. Is the check result normal?

	Go to Step 11 .

	Repair the compression pressure.

STEP 11. Replace the engine-ECU.

After replacing the engine-ECU, re-check the trouble symptoms.

Q. Does trouble symptom persist?

	Check for foreign matters (water, kerosene, etc.) in fuel and replace if necessary.

	Check end.